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SIGMA 24-70mm F2.8 DG OS HSM

Top-level performance optimized for the era of ultra-high-megapixel cameras

The large-diameter standard zoom ideal for today’s ultra-high-megapixel digital cameras

What photographers demand from the 24-70mm F2.8 specification is much more than outstanding image quality. They want all the features that make this a go-to lens for a wide range of photographic opportunities, including optical design ideal for the latest ultra-high-megapixel digital cameras, hypersonic motor (HSM) for high-speed autofocus, optical stabilizer (OS) with powerful stabilization effect, dust- and splash-proof mount with rubber sealing, and a metal barrel for a stable, rigid feel. This all-new 24-70mm F2.8 lens from SIGMA delivers the performance and functionality that help pros succeed in news, nature, and many other fields of photography.

Key features

Outstanding optical performance

Three SLD (Special Low Dispersion) glass lens elements and four aspherical lens elements help minimize optical aberrations. To ensure outstanding image quality from the center to the edges of the photograph, the optical system minimizes coma, which causes points of light to streak, and transverse chromatic aberration, which cannot be corrected via aperture control, The optical system also minimizes distortion, which can be particularly evident in wide-angle shots, resulting in excellent optical performance throughout the zoom range.

A 24-70mm F2.8 lens that meets the high standards of the Art line

SIGMA has continuously pioneered 24-70mm F2.8 lenses that are a step ahead of the times. The first model of this specification, SIGMA 24-70mm F2.8 EX DG ASPHERICAL DF, launched in 2001. Representing the fourth generation of the family, the new SIGMA 24-70mm F2.8 DG OS HSM | Art accomplishes a challenging feat in optical design: incorporating optical stabilizer functionality in a large-diameter standard zoom. By leveraging all of its design and manufacturing expertise, SIGMA has ensured that this new lens fulfills the uncompromising requirements of the Art line for image and build quality.

Bokeh that is a cut above

At wide-open aperture, this lens offers outstanding photographic expression. The area in focus is extremely sharp, while the background exhibits a beautiful bokeh effect with only slight spherical aberration. Since large-diameter zoom lenses are often used at wide-open aperture, SIGMA has paid close attention to the shape of the bokeh, aiming for perfect circularity.

Incorporating advanced aspherical lens processing technology

Aspherical lenses necessitate refined expertise in the design and manufacturing of advanced, high-performance lenses. SIGMA’s first products to feature this technology were the SIGMA 12-24mm F4 DG HSM | Art and SIGMA 14mm F1.8 DG HSM | Art, which both incorporated a large ⌀80mm aspherical lens as their front lens element. Building on the success of these predecessors, the SIGMA 24-70mm F2.8 DG HSM | Art incorporates an aspherical lens element that helps achieve extremely high resolution. This element is much thicker at the center than the edges, and forming its unusual shape is a feat of manufacturing technology. Moreover, SIGMA processes the surface of this aspherical lens element with ultra-precise tolerances that are measured in hundredths of a micrometer. This extremely fine surface allows the SIGMA 24-70mm F2.8 DG HSM | Art to deliver a very natural and smooth bokeh effect, without the visible concentric rings that afflict typical aspherical lens elements.

OS functionality and newly designed HSM for success on any shoot

Designed for advanced utility in a wide variety of situations, the optical stabilizer (OS) offers a powerful stabilization effect. The newly designed large hypersonic motor (HSM) offers 1.3 times the torque of its predecessor and exceptionally stable performance even at lower speeds.

Lens barrel designed for high rigidity

Since large-diameter standard zoom lenses tend to serve as a go-to lens and see frequent use, the SIGMA 24-70mm F2.8 DG HSM | Art is designed to stand up to the challenging shooting environments that pros encounter. To this end, the lens barrel contains a large amount of metal, while the external moving parts feature thermally stable composite (TSC), which is resistant to thermal expansion and contraction. This structure contributes not only to the outstanding optical performance of the lens but also to its high rigidity and confidence-inspiring build quality.

Other features

• Mount with dust- and splash-proof design
• Nikon electromagnetic diaphragm mechanism included
• Fast AF with full-time manual focus
• Compatible with Mount Converter MC-11
• Available SIGMA USB DOCK (Makes customization and flexible adjustment possible)
• Available Mount Conversion Service (Allows use with another camera body)
• Rounded diaphragm
• Designed to minimize flare and ghosting
• High-precision, durable brass bayonet mount
• Evaluation with SIGMA’s own MTF measuring system “A1”
• Made in Japan (With outstanding craftsmanship)
• The lens barrel is engraved with the year of release

Price is public now

Preorders

• EOS - https://www.adorama.com/sg2470dgeos.html
• Nikon - https://www.adorama.com/sg2470dgnk.html
• UK - https://www.parkcameras.com/p/G245593C/canon-lenses-ef-mount/sigma/24-70mm-f28-dg-os-hsm-art-standard-zoom-canon-fit-lens

"Nikon electromagnetic diaphragm mechanism included"

This technology replaces the mechanical iris lever in the lens with electronic control. That makes the lens INCOMPATIBLE with all mechanical speedboosters and MFT adapters. Note that Sigma's Mount Converter MC-11 works only on Sony cameras. In other words, you cannot currently adjust the aperture of the Nikon version of this lens on an MFT camera (because no one makes electronic adapters for Nikon lenses). The Nikon version of the Tamron 85mm f1.8 SP lens is likewise incompatible with MFT cameras.

http://www.photographyblog.com/previews/sigma_24_70mm_f2_8_dg_os_hsm_photos/

Samples

https://www.dpreview.com/samples/0532453776/sample-gallery-sigma-24-70mm-f2-8-dg-os-hsm-art

Review

https://www.lensrentals.com/blog/2017/07/lensrentals-com-review-the-new-sigma-24-70mm-f2-8-dg-os-hsm-art-series-lens/

Field test

http://www.imaging-resource.com/lenses/sigma/24-70mm-f2.8-dg-os-hsm-art/review/#fieldtest

Review

24mm

At wide end central sharpness is off to an excellent start from f/2.8 all the way through to f/8. The standard is still very good at f/11 and f/16, becoming soft by f/22 as diffraction really takes hold. Edges are quite good from f/2.8 to f/5.6, excellent at f/8, very good at f/11, thereafter falling to good at f/16 and quite soft at f/22.

35mm has excellent central sharpness from f/2.8 to f/8 and very good at f/11 and f/16. f/22 is only fairly sharp. The edges are very good at f/2.8, excellent from f/4 to f/8, very good at f/11 and f/16 and again only fair at f/22.

50mm sees excellent central sharpness from f/2.8 to f/5.6. This remains very good from f/8 to f/16, softening at f/22 to fair levels. The edges are very good at f/2.8 and f/4, excellent at f/5.6, very good from f/8 to f/16 and just fair at f/22.

70mm sees excellent central sharpness at f/2.8 and f/4, very good performance at f/5.6 and f/8 and then just fair results from f/11 to f/22. The edges are just fairly sharp all the way through the range, from f/2.8 to f/22, peaking at f/4 but never becoming stellar.

70mm

https://www.ephotozine.com/article/sigma-24-70mm-f-2-8-dg-os-hsm-art-lens-review-31507

Sigma 14-24mm F2.8 DG HSM Art and Sigma 24-70mm F2.8 DG OS HSM Art Receive Prestigious TIPA World Awards 2018

April 19, 2018 – The Sigma Corporation is pleased to announce it has won two TIPA World Awards 2018 for its wide-aperture ultra-wide-angle 14-24mm F2.8 DG HSM Art zoom lens and its large-diameter 24-70mm F2.8 DG OS HSM Art zoom lens suitable for any shoot.

TIPA’s Best DSLR Standard Zoom Lens Award for Sigma 24-70mm F2.8 DG OS HSM Art:

A Premium “All-Round” Zoom

For many photographers, the 24-70mm focal length range is considered the standard as an everyday lens for a wide variety of subjects and scenarios, including street and photojournalism work, candids, travel and even nature and landscape photography. The Sigma 24-70mm F2.8 DG OS HSM Art offers many advantages, including a constant aperture throughout its range, an optical stabilization system, and outstanding bokeh effects due to its 9-blade, rounded-diaphragm, 37cm (15”) close-focusing capability. The lens is dust- and splash-proof and incorporates a newly designed hypersonic motor (HSM) for fast and smooth AF operation. The lens also incorporates the latest electromagnetic aperture control for specific Nikon cameras; the Canon mount is compatible with the Canon Lens Aberration Correction function.

New firmware

This firmware update corrects the phenomenon that the Manual Override (MO) function will be disabled after adjusting the settings of focus mode switch on SIGMA Optimization Pro (Macintosh ver.).

For customers who own the SIGMA USB DOCK, please update the firmware via SIGMA Optimization Pro.

It is possible to update the firmware through either version (Macintosh / Windows) of SIGMA Optimization Pro.

Applicable product:

• SIGMA 24-70mm F2.8 DG OS HSM | Art SIGMA / Canon / Nikon

The benefit of this firmware update:

• Corrected the phenomenon that the Manual Override (MO) function will be disabled after adjusting the settings of focus mode switch on SIGMA Optimization Pro (Macintosh ver.).

SIGMA Optimization Pro Download page\ https://www.sigma-global.com/en/download/lenses/sigma-optimization-pro/

Sigma 24-70mm F2.8 DG OS HSM IF ART Lens deal for $879

https://www.adorama.com/sg2470dgeos.html